1 00:00:04,817 --> 00:00:06,627 Hey everyone, Sinix here. 2 00:00:06,631 --> 00:00:10,044 It's time for another episode of Anatomy Quick Tips, 3 00:00:10,056 --> 00:00:13,510 the series that is here to give you some useful observations 4 00:00:13,510 --> 00:00:15,488 and help you feel more comfortable with 5 00:00:15,488 --> 00:00:17,681 drawing people from imagination. 6 00:00:17,687 --> 00:00:20,395 Today, we'll be talking about arms - 7 00:00:20,395 --> 00:00:22,934 and also, don't be alarmed but 8 00:00:22,934 --> 00:00:27,018 this all-arm video puts us near the end of this series, 9 00:00:27,018 --> 00:00:29,457 only two more videos remain. 10 00:00:29,457 --> 00:00:34,050 Regardless, for now let's just focus on these upper appendages. 11 00:00:34,276 --> 00:00:37,831 This probably won't be the funniest video in this series or anything, 12 00:00:37,831 --> 00:00:40,288 but it will be definitely be the most humerus - 13 00:00:40,288 --> 00:00:43,485 so roll up your sleeves and let's get to work. 14 00:00:43,485 --> 00:00:45,224 Starting out with structure, 15 00:00:45,224 --> 00:00:48,715 we've already covered both shoulders and hands 16 00:00:48,715 --> 00:00:49,600 in other videos, 17 00:00:49,601 --> 00:00:53,355 so we just need to make sure we can bridge these things together. 18 00:00:53,355 --> 00:00:58,210 I'm sketching a quick front, side and back view of a shoulder to start. 19 00:00:58,506 --> 00:01:01,367 Seeing a shoulder and torso without the arm 20 00:01:01,367 --> 00:01:04,235 always reminds me of a little lamb or something... 21 00:01:04,235 --> 00:01:06,783 but anyway, we're going to focus on 22 00:01:06,783 --> 00:01:09,628 the skeletal breakdown of the arm first. 23 00:01:09,628 --> 00:01:12,377 Of course we have a single major bone 24 00:01:12,377 --> 00:01:13,562 in the upper arm 25 00:01:13,562 --> 00:01:15,425 and two in the lower arm 26 00:01:15,425 --> 00:01:16,983 connected at the elbow. 27 00:01:16,983 --> 00:01:21,318 But as i draw that, the first thing I actually want to point out 28 00:01:21,318 --> 00:01:24,090 is that things aren't in a perfect straight line. 29 00:01:24,090 --> 00:01:26,138 You can even take a moment 30 00:01:26,138 --> 00:01:27,737 and try to see this yourself - 31 00:01:27,737 --> 00:01:30,233 just hold one arm out straight 32 00:01:30,233 --> 00:01:32,341 and close your opposite eye. 33 00:01:32,341 --> 00:01:35,582 Now do your best to look directly straight down 34 00:01:35,582 --> 00:01:37,789 the barrel of that massive gun you call 35 00:01:37,789 --> 00:01:38,967 your upper arm. 36 00:01:38,967 --> 00:01:42,186 If you line up your sight from shoulder to elbow, 37 00:01:42,186 --> 00:01:44,687 you'll notice the lower arm doesn't really 38 00:01:44,687 --> 00:01:47,018 line up as much as you might've thought. 39 00:01:47,018 --> 00:01:51,181 To get really good at drawing any organic forms, 40 00:01:51,181 --> 00:01:55,776 it's important to try and identify these types of subtle offsets 41 00:01:55,776 --> 00:01:57,733 as much as possible. 42 00:01:57,733 --> 00:01:59,833 Anyway, let's get back to these bones. 43 00:01:59,833 --> 00:02:01,843 The humerus is of course the bone 44 00:02:01,843 --> 00:02:03,216 of the upper arm, 45 00:02:03,216 --> 00:02:05,982 meanwhile the lower arm has the ulna, 46 00:02:05,982 --> 00:02:08,989 which I would consider the primary lower arm bone. 47 00:02:08,989 --> 00:02:11,498 It's the one you would be hitting someone with 48 00:02:11,498 --> 00:02:12,564 if you elbowed them. 49 00:02:12,609 --> 00:02:15,548 And then the radius, which originates 50 00:02:15,548 --> 00:02:17,933 on the exterior side of the elbow 51 00:02:17,933 --> 00:02:20,806 A.K.A the side that's further away from your body - 52 00:02:20,806 --> 00:02:24,544 and always connects to the thumb-side of your hand. 53 00:02:24,817 --> 00:02:27,799 So we can do a bit of a rotational twisting 54 00:02:27,799 --> 00:02:29,303 around the lower arm. 55 00:02:29,303 --> 00:02:30,761 Hence the name 'radius'. 56 00:02:30,814 --> 00:02:33,336 The last skeletal thing I want to mention 57 00:02:33,336 --> 00:02:34,602 is the funny bone. 58 00:02:34,798 --> 00:02:37,543 This is just an extension of the humerus 59 00:02:37,543 --> 00:02:40,465 which protrudes on the inner side of the elbow 60 00:02:40,465 --> 00:02:41,981 closest to the body. 61 00:02:42,081 --> 00:02:43,390 It's called the funny bone 62 00:02:43,390 --> 00:02:46,047 because of an exposed nerve ending next to it 63 00:02:46,047 --> 00:02:48,293 that will send a shock up your arm 64 00:02:48,293 --> 00:02:50,860 if you hit this part of the elbow against something. 65 00:02:50,900 --> 00:02:53,158 So if you ever see a chance to whack 66 00:02:53,158 --> 00:02:55,882 your friend's funny bone with your pencil or stylus 67 00:02:55,882 --> 00:02:57,636 it's, you know, free comedy. 68 00:02:57,636 --> 00:03:00,987 Alright, I added some hands to these drawings, 69 00:03:00,987 --> 00:03:03,532 and I know this isn't the hands video 70 00:03:03,532 --> 00:03:07,556 but since wrists and organic offsets are so important, 71 00:03:07,556 --> 00:03:11,067 let's do a quick look at that connection anyway. 72 00:03:11,140 --> 00:03:13,027 Now keep in mind by the time 73 00:03:13,027 --> 00:03:15,083 the radius and ulna get to the wrist 74 00:03:15,083 --> 00:03:17,269 they'll always be side by side, 75 00:03:17,269 --> 00:03:19,602 and therefore the lower arm connects in 76 00:03:19,602 --> 00:03:22,296 a much flatter and wider way into the palm 77 00:03:22,296 --> 00:03:23,289 and back of hand, 78 00:03:23,289 --> 00:03:26,230 and thinner from the side view of the hand. 79 00:03:26,412 --> 00:03:28,673 Basic stuff, but the fun part is 80 00:03:28,673 --> 00:03:31,327 any time you're adding a hand to an arm, 81 00:03:31,327 --> 00:03:33,814 make sure to give it a bit of an offset 82 00:03:33,814 --> 00:03:38,198 and step over toward the thumb/radius side of things. 83 00:03:38,630 --> 00:03:42,113 Similarly, from the side view the hand should always 84 00:03:42,113 --> 00:03:46,390 take a noticeable offsetting step toward the palm side. 85 00:03:46,697 --> 00:03:49,096 By the way when I say the word 'offset' 86 00:03:49,096 --> 00:03:53,492 it usually just means not lined up evenly with surrounding things. 87 00:03:53,698 --> 00:03:56,802 Anyway, always make sure the thumb side of the hand 88 00:03:56,802 --> 00:03:59,477 feels more chunkier and substantial 89 00:03:59,477 --> 00:04:01,366 than the pinky side of the palm. 90 00:04:01,606 --> 00:04:03,362 With all of these ideas in mind, 91 00:04:03,362 --> 00:04:06,298 you should be able to develop a quick shorthand 92 00:04:06,298 --> 00:04:08,834 for getting from the arm into the hand. 93 00:04:08,834 --> 00:04:10,760 In fact, you should be able to 94 00:04:10,760 --> 00:04:13,652 quickly deduce everything about the bones 95 00:04:13,657 --> 00:04:16,787 and orientation of the wrist without ever seeing 96 00:04:16,787 --> 00:04:20,283 the thumbs or fingers or any interior information. 97 00:04:20,283 --> 00:04:23,208 So maybe see how quickly you can determine 98 00:04:23,208 --> 00:04:25,229 where the radius and the ulna are 99 00:04:25,229 --> 00:04:27,916 in any of these rough sketches I'm making. 100 00:04:27,916 --> 00:04:31,557 Hopefully that seems easy enough. 101 00:04:31,557 --> 00:04:35,415 Let's get back to structure and talk about the muscle side of things. 102 00:04:35,488 --> 00:04:37,509 We're going to make it really easy 103 00:04:37,509 --> 00:04:38,967 for our drawing purposes 104 00:04:38,967 --> 00:04:41,759 and only focus on three muscle groups. 105 00:04:41,834 --> 00:04:45,050 The biceps are on the front of your upper arm 106 00:04:45,050 --> 00:04:47,307 and allow you to curl up your arm. 107 00:04:47,375 --> 00:04:51,982 They insert under your shoulder muscles and chest muscles on one end 108 00:04:51,982 --> 00:04:56,161 and connect to the radius and tissue around the ulna on the other end. 109 00:04:56,340 --> 00:04:59,181 The triceps are on the back of your arm 110 00:04:59,181 --> 00:05:01,550 and allow you to pull your arm straight. 111 00:05:01,550 --> 00:05:06,206 They also come out from under your shoulder muscles and similar back muscles 112 00:05:06,206 --> 00:05:08,532 and connect to the end of the ulna. 113 00:05:08,682 --> 00:05:12,532 And yes, the deltoids are of course the shoulder muscles, 114 00:05:12,532 --> 00:05:17,244 but the third muscle that we're going to be fixating on in this video 115 00:05:17,244 --> 00:05:20,101 is going to be the brachioradialis. 116 00:05:20,212 --> 00:05:23,585 You must learn to love the brachioradialis, 117 00:05:23,585 --> 00:05:27,853 it will be a pivotal part of this video in more ways than one. 118 00:05:28,322 --> 00:05:32,055 These insertions points are important, so keep them in mind. 119 00:05:32,055 --> 00:05:35,800 It connects from the lower back of the humerus 120 00:05:36,178 --> 00:05:39,509 under the triceps and it wraps around a bit 121 00:05:39,509 --> 00:05:42,015 over parts of the lower biceps and 122 00:05:42,015 --> 00:05:44,891 connects to the radius on the other side. 123 00:05:45,167 --> 00:05:49,536 I will be exaggerating this muscle heavily throughout this video, 124 00:05:49,536 --> 00:05:52,791 so be aware of that strategic inflation. 125 00:05:52,791 --> 00:05:55,210 We are going all in on the bray-ray. 126 00:05:55,453 --> 00:05:58,100 I think that's enough structure though, so 127 00:05:58,100 --> 00:06:00,567 let's get into some drawing practice. 128 00:06:00,737 --> 00:06:03,266 A big theme in the land of arms will be 129 00:06:03,266 --> 00:06:05,521 controlling our organic curves. 130 00:06:05,563 --> 00:06:09,563 So I guess I will do a quick recap on s-curves and c-curves. 131 00:06:09,768 --> 00:06:12,095 Don't let the names throw you off too much, 132 00:06:12,224 --> 00:06:15,363 most of the s-curves and c-curves you'll be drawing 133 00:06:15,363 --> 00:06:17,974 are going to be extremely subtle. 134 00:06:17,974 --> 00:06:21,204 Just a whisper of curvature going on most of the time. 135 00:06:21,204 --> 00:06:24,124 And it's good to practice that level of control 136 00:06:24,291 --> 00:06:27,208 but an even more important thing to practise 137 00:06:27,208 --> 00:06:29,657 is your ability to weight your curves. 138 00:06:29,810 --> 00:06:31,924 Weighting a curve means changing up 139 00:06:31,924 --> 00:06:34,970 the harshness of the curvature through the line. 140 00:06:35,395 --> 00:06:39,091 So if the curve stays consistent from start to finish, 141 00:06:39,091 --> 00:06:41,033 that would be a weightless curve. 142 00:06:41,345 --> 00:06:44,617 You can have the curve be increasingly strong at the start 143 00:06:44,617 --> 00:06:46,098 or the end of the line 144 00:06:46,098 --> 00:06:48,571 to give it weight in a specific direction. 145 00:06:48,924 --> 00:06:52,032 This is very, very important to practise 146 00:06:52,032 --> 00:06:55,242 because we spend our entire childhoods writing 147 00:06:55,242 --> 00:06:58,886 letters and shapes which curve in a very balanced way, 148 00:06:59,243 --> 00:07:01,433 but the more you can break away from that 149 00:07:01,433 --> 00:07:04,022 the more organic your drawings will be, 150 00:07:04,022 --> 00:07:06,059 so warm up with these often. 151 00:07:06,324 --> 00:07:09,642 Alright, let's get into those simplifications and reductions. 152 00:07:10,157 --> 00:07:13,211 Or, rather maybe mention another little side thing...? 153 00:07:13,642 --> 00:07:16,692 Sorry, there's a lot of ways to think about arms. 154 00:07:16,692 --> 00:07:18,199 Such as the chain, 155 00:07:18,199 --> 00:07:20,353 a common trick for approaching arms 156 00:07:20,353 --> 00:07:23,183 is to imagine a giant linking chain - 157 00:07:23,183 --> 00:07:26,366 the idea being that since the upper arm is 158 00:07:26,366 --> 00:07:29,166 wider from the side view than from a front view, 159 00:07:29,538 --> 00:07:32,181 and meanwhile the forearm is the opposite, 160 00:07:32,181 --> 00:07:36,667 it will generally create a nice little back and forth between wide and narrow 161 00:07:36,667 --> 00:07:39,549 which is definitely good for aesthetic purposes. 162 00:07:39,733 --> 00:07:43,241 So you can use that as a little mental note when applicable. 163 00:07:43,491 --> 00:07:46,616 Meanwhile, to go back to what we've just talked about 164 00:07:46,616 --> 00:07:50,616 with curve weight, the most important mental note I fixate on 165 00:07:50,616 --> 00:07:54,967 is usually just where to weight the curve for each part of the arm. 166 00:07:55,150 --> 00:07:57,824 On the bicep side of the upper arm, 167 00:07:57,824 --> 00:08:00,922 the curve weight is further toward the elbow. 168 00:08:00,922 --> 00:08:04,405 Whereas on the back or tricep side of things, 169 00:08:04,405 --> 00:08:07,037 the curve weight is closer to the shoulder. 170 00:08:07,037 --> 00:08:11,417 The brachioradialis is definitely weighted toward the upper forearm, 171 00:08:11,417 --> 00:08:14,203 but is more rounded and gradual than 172 00:08:14,203 --> 00:08:16,015 the opposite side of the forearm. 173 00:08:16,015 --> 00:08:17,967 All of these things relate to 174 00:08:17,967 --> 00:08:20,900 the actual muscle bodies of each muscle group, 175 00:08:20,900 --> 00:08:23,285 the tricep being the most important one 176 00:08:23,285 --> 00:08:24,645 to always remember, because 177 00:08:24,645 --> 00:08:28,645 the muscle bodies are located in the top half of the upper arm. 178 00:08:28,645 --> 00:08:32,247 Okay so let's sum up the straight arm simplifications 179 00:08:32,247 --> 00:08:33,738 a bit more directly. 180 00:08:33,738 --> 00:08:36,976 Back view of the arm, pop forward, minimal twisting. 181 00:08:36,976 --> 00:08:40,758 The upper arm might as well just be a simple cylinder 182 00:08:40,758 --> 00:08:42,303 with minimal tapering. 183 00:08:42,303 --> 00:08:44,118 But the lower arm is going to feel 184 00:08:44,118 --> 00:08:46,516 closer to an upside down bowling pin. 185 00:08:46,516 --> 00:08:48,355 The important part is that 186 00:08:48,355 --> 00:08:51,493 the exterior side, with the brachioradialis 187 00:08:51,493 --> 00:08:55,616 is going to not only curve outward more than the interior side, 188 00:08:55,616 --> 00:08:58,498 but also come up a bit higher than it. 189 00:08:58,498 --> 00:09:00,379 It should definitely feel like 190 00:09:00,379 --> 00:09:03,122 it starts its s-curve above the elbow. 191 00:09:03,763 --> 00:09:06,330 If we raise the arm up out to the side, 192 00:09:06,330 --> 00:09:09,350 yes you'll get a bit of the chain concept, 193 00:09:09,350 --> 00:09:13,212 but since you'll probably not be drawing massive bodybuilders 194 00:09:13,212 --> 00:09:15,321 it can become pretty minor. 195 00:09:15,679 --> 00:09:17,599 You do want to make sure that 196 00:09:17,599 --> 00:09:19,956 you're thinking about weight and gravity though. 197 00:09:20,300 --> 00:09:23,353 Obviously this gets a lot more extreme with age, 198 00:09:23,353 --> 00:09:25,236 but on any body type 199 00:09:25,236 --> 00:09:27,081 you should still be using these ideas 200 00:09:27,081 --> 00:09:30,490 to give you at least a little bit of subtle curve weight. 201 00:09:30,706 --> 00:09:33,299 Another useful reference point to think about 202 00:09:33,299 --> 00:09:34,881 comes from the shoulder muscle. 203 00:09:35,088 --> 00:09:37,636 The deltoid comes down to a bit 204 00:09:37,636 --> 00:09:40,540 of a point on the exterior of the arm. 205 00:09:40,629 --> 00:09:43,162 While not exact, this can still be used 206 00:09:43,162 --> 00:09:45,519 as a good way to indicate a break 207 00:09:45,519 --> 00:09:48,326 between the front bicep side of the arm, 208 00:09:48,326 --> 00:09:50,684 and the rare tricep side. 209 00:09:50,684 --> 00:09:54,147 Especially when you're dealing with more complex poses 210 00:09:54,147 --> 00:09:55,582 and off angle views. 211 00:09:55,582 --> 00:09:59,226 If I draw a quick arm over here on the left 212 00:09:59,226 --> 00:10:01,444 from a slightly awkward angle, 213 00:10:01,444 --> 00:10:04,383 adding the deltoid and letting it point a line 214 00:10:04,383 --> 00:10:06,241 towards the elbow can at least 215 00:10:06,241 --> 00:10:10,749 help us visualise the tricep and bicep sides of the arm. 216 00:10:10,908 --> 00:10:13,930 If this drawing looks weirdly off to you at first, 217 00:10:13,930 --> 00:10:14,914 that's good! 218 00:10:14,914 --> 00:10:18,914 The brachioradialis was not coming from the correct spot. 219 00:10:18,914 --> 00:10:22,666 Let's first recall that the brachioradialis should come from 220 00:10:22,666 --> 00:10:25,514 under the triceps and over the biceps, 221 00:10:25,514 --> 00:10:27,993 and using that line from the deltoid 222 00:10:27,993 --> 00:10:30,266 we can visualise this insertion 223 00:10:30,266 --> 00:10:31,653 much more clearly. 224 00:10:31,653 --> 00:10:32,828 Moving along, 225 00:10:32,828 --> 00:10:34,925 some of these straight armed elbows 226 00:10:34,925 --> 00:10:37,307 might be looking a bit wonky. 227 00:10:37,307 --> 00:10:39,041 So let's briefly mention them. 228 00:10:39,041 --> 00:10:42,910 The most important part of simplifying the elbow' 229 00:10:42,910 --> 00:10:44,635 will definitely come from seeing 230 00:10:44,635 --> 00:10:48,524 the triceps and humerus all come together in a mass 231 00:10:48,524 --> 00:10:51,000 that leads straight down through the elbow 232 00:10:51,000 --> 00:10:52,058 and into the ulna. 233 00:10:52,058 --> 00:10:55,481 The funny bone and radius both become a bit 234 00:10:55,481 --> 00:10:57,377 indented on a straight arm, 235 00:10:57,377 --> 00:10:59,012 so you'll mostly see these 236 00:10:59,012 --> 00:11:00,870 little pockets of depth off to 237 00:11:00,870 --> 00:11:03,919 both sides of the triceps and ulna, with 238 00:11:03,919 --> 00:11:06,510 the forearm muscles pulling the forms back out 239 00:11:06,510 --> 00:11:09,219 and really solidifying those crevices. 240 00:11:09,431 --> 00:11:12,116 There's definitely a lot of skin going on 241 00:11:12,116 --> 00:11:14,726 in this area, so it tends to become quite 242 00:11:14,726 --> 00:11:17,790 wrinkly. There's even a slang name for this 243 00:11:17,790 --> 00:11:20,191 folded up skin - it's called the wenis. 244 00:11:20,545 --> 00:11:24,223 So, everybody should draw the wenis, the wenis is not a dance, 245 00:11:24,223 --> 00:11:26,580 and I'm happy to tell you this in advance. 246 00:11:26,580 --> 00:11:31,633 [laughs] Anyway, wrinkles are tricky. The general rule is to fold the skin with 247 00:11:31,633 --> 00:11:35,789 c-curves and s-curves in a way that squishes the curves together 248 00:11:35,789 --> 00:11:38,609 without ever feeling like they're going to cross each other 249 00:11:38,609 --> 00:11:40,935 or pass through the extended implied 250 00:11:40,935 --> 00:11:42,626 lines of other curves. 251 00:11:42,626 --> 00:11:44,951 You can compress a bunch of them into 252 00:11:44,951 --> 00:11:49,654 a small space, or just a couple, but I recommend wrinkling things up 253 00:11:49,654 --> 00:11:52,271 a bit above the elbow with perhaps some 254 00:11:52,271 --> 00:11:55,376 more drapery style folds hanging underneath. 255 00:11:55,376 --> 00:11:58,131 You can definitely develop your own stylistic 256 00:11:58,131 --> 00:12:03,117 approach to wrinkles, and they should feel similar in theory to clothing folds, 257 00:12:03,117 --> 00:12:05,481 but more organic with the lines. 258 00:12:05,481 --> 00:12:08,095 Just keep in mind, like with clothing folds, 259 00:12:08,095 --> 00:12:10,800 doing less is usually better when learning. 260 00:12:10,800 --> 00:12:15,091 Alright, a little bit more drawing in this section, because I want to 261 00:12:15,091 --> 00:12:18,633 also just quickly mention some size relations. 262 00:12:18,881 --> 00:12:23,377 I'm a serial offender of making my deltoids too small in drawings, 263 00:12:23,377 --> 00:12:27,815 so I'm trying to correct that. I think it can be useful to think of the upper 264 00:12:27,815 --> 00:12:32,010 arms as a length that goes from the top of the shoulder to the elbow. 265 00:12:32,262 --> 00:12:34,531 The top third of that length can be the 266 00:12:34,531 --> 00:12:37,370 distance of the deltoid going down the arm. 267 00:12:37,370 --> 00:12:40,165 I barely mentioned it before, but the triceps 268 00:12:40,165 --> 00:12:44,620 really have two main visible muscle bodies on the back of the arm. 269 00:12:44,620 --> 00:12:47,844 While they both have those high up muscle bodies, 270 00:12:47,844 --> 00:12:51,965 the interior side one is a bit longer down toward the elbow, 271 00:12:51,965 --> 00:12:56,123 while the exterior one is even more focussed at the top. 272 00:12:56,227 --> 00:13:00,434 The bottom of these muscle bodies and strong separation of them 273 00:13:00,434 --> 00:13:05,004 occurs roughly halfway down the upper arm unit, that we mentioned going 274 00:13:05,004 --> 00:13:06,974 from top of shoulder to elbow. 275 00:13:06,974 --> 00:13:11,477 You can kind of indicate this with a little butt shape on the back of the arm, 276 00:13:11,477 --> 00:13:15,327 especially if it's being flexed. The arm, not the butt. 277 00:13:15,327 --> 00:13:19,090 Okay, moving along to the world of movement, 278 00:13:19,090 --> 00:13:22,199 the elbow is basically just a fancy hinge 279 00:13:22,199 --> 00:13:27,274 joint with the funny bone on the interior, the ulna being the king in the center, 280 00:13:27,274 --> 00:13:31,854 and the radius on the exterior. When the arm is straight, they somewhat 281 00:13:31,854 --> 00:13:34,189 line up with the ulna sticking out a bit. 282 00:13:34,189 --> 00:13:36,744 From the interior view though, once 283 00:13:36,744 --> 00:13:41,237 we start curling the arm, obviously the funny bone isn't going anywhere. 284 00:13:41,237 --> 00:13:46,666 But the ulna is going to hinge around it and form a very boxy and angular 285 00:13:46,666 --> 00:13:51,688 silhouette, by letting your brain fixate on the line from funny bone to ulna. 286 00:13:51,951 --> 00:13:57,105 All of the tissue of the arm is going to crease at the insertion of the bicep and 287 00:13:57,105 --> 00:14:01,751 form a bit of a line that points mostly toward the funny bone side of things. 288 00:14:01,797 --> 00:14:07,267 The important take away is that interior arm equals boxy shape and long crease. 289 00:14:07,267 --> 00:14:11,067 Also, when you raise your arm with your bicep toward the sky, 290 00:14:11,067 --> 00:14:15,473 that means the deltoid is going to be pulled to the back of the shoulder. 291 99:59:59,999 --> 99:59:59,999 As it, once again, needs to be pointing towards the exterior line between 292 99:59:59,999 --> 99:59:59,999 bicep and tricep. 293 99:59:59,999 --> 99:59:59,999 Anyway, the exterior elbow view is a bit interesting. 294 99:59:59,999 --> 99:59:59,999 You'll of course be seeing the deltoid a lot more in this view 295 99:59:59,999 --> 99:59:59,999 where the exterior is facing back, 296 99:59:59,999 --> 99:59:59,999 but the interesting part is that you're now seeing 297 99:59:59,999 --> 99:59:59,999 both the radius and ulna in the straightened arm view. 298 99:59:59,999 --> 99:59:59,999 This means that when you curl your arm, those two lower 299 99:59:59,999 --> 99:59:59,999 arm bones are going to be traveling together. 300 99:59:59,999 --> 99:59:59,999 Even though the silhouette will fundamentally be the same, 301 99:59:59,999 --> 99:59:59,999 I find it very useful to acknowledge this anatomy by making the elbow 302 99:59:59,999 --> 99:59:59,999 feel like it just rounds up to and around these bones, 303 99:59:59,999 --> 99:59:59,999 instead of feeling boxy. 304 99:59:59,999 --> 99:59:59,999 You might also remember that the brachioradialis is on the exterior side, 305 99:59:59,999 --> 99:59:59,999 so that will create a mass in form that will squeeze from upper arm 306 99:59:59,999 --> 99:59:59,999 to lower arm. 307 99:59:59,999 --> 99:59:59,999 Because of this mass, the exterior crease here becomes a lot more 308 99:59:59,999 --> 99:59:59,999 chubbier and compressed. 309 99:59:59,999 --> 99:59:59,999 I like to use a shorter and splitting crease to hint at this 310 99:59:59,999 --> 99:59:59,999 thicker form. 311 99:59:59,999 --> 99:59:59,999 And you should try to hint at these things in any body type. 312 99:59:59,999 --> 99:59:59,999 From a different view, you can get some idea how all of these bones 313 99:59:59,999 --> 99:59:59,999 and muscles are working, but for now let's jump over to the 314 99:59:59,999 --> 99:59:59,999 forearm movements, because we have rotation to deal with. 315 99:59:59,999 --> 99:59:59,999 If you stick your right harm out in front of you, 316 99:59:59,999 --> 99:59:59,999 palm side up, this is the least twisted view of your forearem. 317 99:59:59,999 --> 99:59:59,999 The muscles and bones just carry forth to the hand in a linear fashion. 318 99:59:59,999 --> 99:59:59,999 This represents one extreme of your rotational movement. 319 99:59:59,999 --> 99:59:59,999 As we rotate the hand, the elbow won't be changing much, 320 99:59:59,999 --> 99:59:59,999 but the radius and brachioradialis will start twisting a bit 321 99:59:59,999 --> 99:59:59,999 to line up vertically at the wrist. 322 99:59:59,999 --> 99:59:59,999 The best thing you should observe on your own arm 323 99:59:59,999 --> 99:59:59,999 is how the s-curves are just as you rotate your hand. 324 99:59:59,999 --> 99:59:59,999 I'm not in love with the drawing on the right here, 325 99:59:59,999 --> 99:59:59,999 but the interior ulna side of things definitely changes up its 326 99:59:59,999 --> 99:59:59,999 s-curve the most, whereas the exterior side 327 99:59:59,999 --> 99:59:59,999 just shifts weight a little. 328 99:59:59,999 --> 99:59:59,999 Once your palm is facing downwards, the full range of motion is complete. 329 99:59:59,999 --> 99:59:59,999 This is as far as things can twist. 330 99:59:59,999 --> 99:59:59,999 The radius and ulna are now on opposite sides from the elbow. 331 99:59:59,999 --> 99:59:59,999 You might be thinking, 'what if I want to give a thumbs down?' 332 99:59:59,999 --> 99:59:59,999 Well, physically you can't. So be sure to remember that and like this video. 333 99:59:59,999 --> 99:59:59,999 If you do really want to point your thumb down, 334 99:59:59,999 --> 99:59:59,999 it requires you to actually rotate your entire arm so that your 335 99:59:59,999 --> 99:59:59,999 elbow is facing a different direction. 336 99:59:59,999 --> 99:59:59,999 Lastly, here I'll just mention, when your arms are at rest at your sides, 337 99:59:59,999 --> 99:59:59,999 the default comfortable state is that central, half-twisted state, 338 99:59:59,999 --> 99:59:59,999 not the completely untwisted state. 339 99:59:59,999 --> 99:59:59,999 Alright, let's go back to reducing information and recap what we've learned. 340 99:59:59,999 --> 99:59:59,999 Of course, it's pretty fun to draw giant musclebound arms, 341 99:59:59,999 --> 99:59:59,999 especially when you're trying to commit all these concepts to memory, 342 99:59:59,999 --> 99:59:59,999 but we also want to be able to simplify these things down 343 99:59:59,999 --> 99:59:59,999 into little anime stick arms. 344 99:59:59,999 --> 99:59:59,999 When you start out in art, it's fine to just think of the upper and lower arms 345 99:59:59,999 --> 99:59:59,999 as just cylinders, and as you get more comfortable, 346 99:59:59,999 --> 99:59:59,999 you can introduce some tapering into these forms. 347 99:59:59,999 --> 99:59:59,999 Eventually you will want to be capable of some level 348 99:59:59,999 --> 99:59:59,999 of form complexity. These cross sections are never just round. 349 99:59:59,999 --> 99:59:59,999 They have weird oblong shapes and blobby looking contours. 350 99:59:59,999 --> 99:59:59,999 I like to practice these things with what I would call 351 99:59:59,999 --> 99:59:59,999 skinny muscle forms. 352 99:59:59,999 --> 99:59:59,999 Maybe it's just my Samurai Champloo roots coming through again. 353 99:59:59,999 --> 99:59:59,999 A quick example though, starting with a deltoid and shoulder, 354 99:59:59,999 --> 99:59:59,999 letting it point toward an elbow, think I'll twist the bicep to the bottom on this one, 355 99:59:59,999 --> 99:59:59,999 bicep means curve weight closer to elbows, so we can even dive in 356 99:59:59,999 --> 99:59:59,999 with some angular shapes. 357 99:59:59,999 --> 99:59:59,999 With the bicep facing forward, that means the deltoid 358 99:59:59,999 --> 99:59:59,999 can be a bit further on top instead of on the back, 359 99:59:59,999 --> 99:59:59,999 and we can even hint at some tricep form above the separating line. 360 99:59:59,999 --> 99:59:59,999 That line will let us know where to pull the brachioradialis from, 361 99:59:59,999 --> 99:59:59,999 and then we can decide on the hand rotation and 362 99:59:59,999 --> 99:59:59,999 make everything line up. 363 99:59:59,999 --> 99:59:59,999 Design wise, it's good to play around with the ratios of rounded 364 99:59:59,999 --> 99:59:59,999 shapes and angular shapes. 365 99:59:59,999 --> 99:59:59,999 We alluded earlier to the exterior side feeling more rounded 366 99:59:59,999 --> 99:59:59,999 and the interior feeling more angular, when 367 99:59:59,999 --> 99:59:59,999 discussing the elbow hinge, 368 99:59:59,999 --> 99:59:59,999 so let's just run with that a bit more. 369 99:59:59,999 --> 99:59:59,999 What if we just always simplified things around the elbow 370 99:59:59,999 --> 99:59:59,999 by playing up rounded exteriors and angular interiors in the forearm? 371 99:59:59,999 --> 99:59:59,999 I just noticed that that letter pointing towards the tricep is a D instead of a T. 372 99:59:59,999 --> 99:59:59,999 Clearly getting a bit delirious at this point. 373 99:59:59,999 --> 99:59:59,999 Regardless, let's keep sketching. 374 99:59:59,999 --> 99:59:59,999 Here's a quick side view, still mostly practicing curve weights and that brachioradialis. 375 99:59:59,999 --> 99:59:59,999 Some slightly more exciting things we could try 376 99:59:59,999 --> 99:59:59,999 would be playing around with perspective and dynamic angles. 377 99:59:59,999 --> 99:59:59,999 If we imagine a Spiderman type arm pose, we could still 378 99:59:59,999 --> 99:59:59,999 think about where we could exaggerate our forearm muscles. 379 99:59:59,999 --> 99:59:59,999 I'll be honest though, I sort of got distracted right after starting 380 99:59:59,999 --> 99:59:59,999 this one, because I thought of some more stuff to mention. 381 99:59:59,999 --> 99:59:59,999 Such as, what does it look like if you 382 99:59:59,999 --> 99:59:59,999 just have your elbow sticking up in the air 383 99:59:59,999 --> 99:59:59,999 with your arm curled behind it? 384 99:59:59,999 --> 99:59:59,999 A lot of tricep weight at the bottom, 385 99:59:59,999 --> 99:59:59,999 but it really things out into a very skeletal look 386 99:59:59,999 --> 99:59:59,999 at the elbow. It does give a nice look at the radius, ulna and funny bone. 387 99:59:59,999 --> 99:59:59,999 This becomes instantly obscured by the forearm 388 99:59:59,999 --> 99:59:59,999 once you straighten the arm out a bit with those forearm muscles 389 99:59:59,999 --> 99:59:59,999 just taking over both sides of the elbow. 390 99:59:59,999 --> 99:59:59,999 But, this made me think of another scenario, 391 99:59:59,999 --> 99:59:59,999 how about when you're resting your weight 392 99:59:59,999 --> 99:59:59,999 on your elbow at a desk or table? 393 99:59:59,999 --> 99:59:59,999 Where do those forearm muscles go then? 394 99:59:59,999 --> 99:59:59,999 Well, since the brachioradialis connects to the humerus, 395 99:59:59,999 --> 99:59:59,999 it actually sits up higher, away from the elbow on the exterior side of things. 396 99:59:59,999 --> 99:59:59,999 I guess that's obvious enough, kind of like how it would look if you were 397 99:59:59,999 --> 99:59:59,999 drinking something. 398 99:59:59,999 --> 99:59:59,999 Just always be keeping track of where the thumb is, 399 99:59:59,999 --> 99:59:59,999 and where the exterior and interior of the elbow are, 400 99:59:59,999 --> 99:59:59,999 and you'll be fine. 401 99:59:59,999 --> 99:59:59,999 Now, we always have a common mistakes part in these videos. 402 99:59:59,999 --> 99:59:59,999 But, I think I've gone over things so much that we can try a pop quiz instead. 403 99:59:59,999 --> 99:59:59,999 I'll show a quick drawing with some weird mistake, and we'll see if 404 99:59:59,999 --> 99:59:59,999 you can deduce the problem. 405 99:59:59,999 --> 99:59:59,999 Like this. What's wrong with this? 406 99:59:59,999 --> 99:59:59,999 Well, you have two possible answers on this one, since we can't see the shoulder. 407 99:59:59,999 --> 99:59:59,999 We seem to be looking at the front of an arm, so either the brachioradialis 408 99:59:59,999 --> 99:59:59,999 is on the wrong side, or the hand should be mirrored. 409 99:59:59,999 --> 99:59:59,999 How about this one? Anything seem off to you? 410 99:59:59,999 --> 99:59:59,999 Well, I'm messing with you a bit, because 411 99:59:59,999 --> 99:59:59,999 it's the same thing, except this time you can see the deltoid, 412 99:59:59,999 --> 99:59:59,999 so there's only one answer. 413 99:59:59,999 --> 99:59:59,999 The brachioradialis is on the wrong side again. It should be on the exterior, 414 99:59:59,999 --> 99:59:59,999 not interior. 415 99:59:59,999 --> 99:59:59,999 Alright, I promise this one will be different. 416 99:59:59,999 --> 99:59:59,999 What's wrong this time? 417 99:59:59,999 --> 99:59:59,999 Doesn't seem too far off, the deltoid and forearm stuff seem okayish, 418 99:59:59,999 --> 99:59:59,999 this might be a subtle one, but I reversed the weight on the 419 99:59:59,999 --> 99:59:59,999 bicep and tricep curves. 420 99:59:59,999 --> 99:59:59,999 Remember the tricep should have mass closer to the shoulder, and the bicep 421 99:59:59,999 --> 99:59:59,999 curves closer to the elbow. 422 99:59:59,999 --> 99:59:59,999 That's a bit better. 423 99:59:59,999 --> 99:59:59,999 One last one. 424 99:59:59,999 --> 99:59:59,999 What's wrong now? 425 99:59:59,999 --> 99:59:59,999 Hmm, the brachioradialis is on the exterior, so that's fine. 426 99:59:59,999 --> 99:59:59,999 But it still looks a little strange. 427 99:59:59,999 --> 99:59:59,999 Well, that's because it needs to go over the bicep, not under it. 428 99:59:59,999 --> 99:59:59,999 And with that, I think we're done learning. 429 99:59:59,999 --> 99:59:59,999 You have graduated to the part of the video where we just take everything 430 99:59:59,999 --> 99:59:59,999 we learned and try to draw and paint arms from imagination. 431 99:59:59,999 --> 99:59:59,999 Hopefully they wind up looking alright. 432 99:59:59,999 --> 99:59:59,999 I will be using a simple flat brush for these lines, with pressure sensitivity 433 99:59:59,999 --> 99:59:59,999 mostly on size, but with a bit on opacity. 434 99:59:59,999 --> 99:59:59,999 That should make it feel pretty comfy and natural. 435 99:59:59,999 --> 99:59:59,999 One big concern I had going into this final section, 436 99:59:59,999 --> 99:59:59,999 is trying to make sure it stays focused on arms. 437 99:59:59,999 --> 99:59:59,999 Shoulders are a bit unavoidable, but I tried experimenting 438 99:59:59,999 --> 99:59:59,999 with ways to make the hands get less attention. 439 99:59:59,999 --> 99:59:59,999 Literal disjointed fingers and whatnot. 440 99:59:59,999 --> 99:59:59,999 Unfortunately, that actually made them stand out more, 441 99:59:59,999 --> 99:59:59,999 in rules of focus and contrast and whatnot, 442 99:59:59,999 --> 99:59:59,999 so eventually I'll get rid of that idea. 443 99:59:59,999 --> 99:59:59,999 What actually wound up being the biggest issue 444 99:59:59,999 --> 99:59:59,999 is just trying to come up with a good variety of poses. 445 99:59:59,999 --> 99:59:59,999 Once again, I considered crazy foreshortening, 446 99:59:59,999 --> 99:59:59,999 but then the page might feel less cohesive with the more traditional 447 99:59:59,999 --> 99:59:59,999 perspectives. 448 99:59:59,999 --> 99:59:59,999 I don't know. But I'm definitely enjoying the line art quality. 449 99:59:59,999 --> 99:59:59,999 There are a couple of disjointed lines here and there, 450 99:59:59,999 --> 99:59:59,999 but I tried to hit a good number of the c-curves and s-curves 451 99:59:59,999 --> 99:59:59,999 in single strokes. 452 99:59:59,999 --> 99:59:59,999 That can result in a lot of putting something down and then undoing it, 453 99:59:59,999 --> 99:59:59,999 redoing it, until I figure out what I want it to look like, 454 99:59:59,999 --> 99:59:59,999 but I'm mostly okay with that method. 455 99:59:59,999 --> 99:59:59,999 I can't be too chaotic with styles, but I did try to at least vary up 456 99:59:59,999 --> 99:59:59,999 the muscularity levels a bit as it goes on. 457 99:59:59,999 --> 99:59:59,999 My brain was pretty drained from all the previous arm drawings, 458 99:59:59,999 --> 99:59:59,999 so there are definitely a couple of moments where I've made up an arm 459 99:59:59,999 --> 99:59:59,999 and then moments later realised it was almost identical to one that was 460 99:59:59,999 --> 99:59:59,999 already on the page, like this last one. 461 99:59:59,999 --> 99:59:59,999 But I just decided to adjust the angle of it a bit and move on. 462 99:59:59,999 --> 99:59:59,999 For colors, I don't know how much I can really say that would be new, 463 99:59:59,999 --> 99:59:59,999 the skin video as well as the other videos have really covered the general 464 99:59:59,999 --> 99:59:59,999 stuff. But you can see I've lightened the line art into a lighter reddish tone, 465 99:59:59,999 --> 99:59:59,999 and then threw in my normal dull minty background. 466 99:59:59,999 --> 99:59:59,999 I like to mask out everything in order to watch transparency, which can 467 99:59:59,999 --> 99:59:59,999 be a bit tedious, but usually worth it in the long run. 468 99:59:59,999 --> 99:59:59,999 A big piece of advice is to make sure you don't instinctually start 469 99:59:59,999 --> 99:59:59,999 pressing hard with your stylus when blocking. 470 99:59:59,999 --> 99:59:59,999 This is always the most dangerous time for your hand and wrist health, 471 99:59:59,999 --> 99:59:59,999 because we tend to dig in harder when filling things in. 472 99:59:59,999 --> 99:59:59,999 Pressure is bad for your tendons. 473 99:59:59,999 --> 99:59:59,999 Anyway, once everything is blocked in, we can try out a variety 474 99:59:59,999 --> 99:59:59,999 of skin tones across the page. 475 99:59:59,999 --> 99:59:59,999 This is also a great time to introduce some hue variety by air brushing 476 99:59:59,999 --> 99:59:59,999 in reds on areas that might catch more sun damage, and things like that. 477 99:59:59,999 --> 99:59:59,999 The next step is form rendering, and I know some people like a more 478 99:59:59,999 --> 99:59:59,999 smooth gradiation and some people like a more chunkier chaotic painting approach. 479 99:59:59,999 --> 99:59:59,999 But, I'm going to try out some weirder ideas, 480 99:59:59,999 --> 99:59:59,999 and just try defining forms with blocky, contour tracing strokes. 481 99:59:59,999 --> 99:59:59,999 Honestly it's a bit weird at times for these videos, because I don't find myself 482 99:59:59,999 --> 99:59:59,999 with a strong preference. 483 99:59:59,999 --> 99:59:59,999 In my mind, as long as you have some understanding of the forms 484 99:59:59,999 --> 99:59:59,999 you can always either step up how abstract and chunky things are, 485 99:59:59,999 --> 99:59:59,999 or step it back into hypersoft air brushing. 486 99:59:59,999 --> 99:59:59,999 In any case, the important part is just knowing where the hard edges 487 99:59:59,999 --> 99:59:59,999 and soft edges should be. 488 99:59:59,999 --> 99:59:59,999 Now, how do you know which edges are hard and which are soft? 489 99:59:59,999 --> 99:59:59,999 Well, it's simple. If you would be okay with seeing an actual line at a specific 490 99:59:59,999 --> 99:59:59,999 spot in your drawing, then that can be a hard edge in your painting. 491 99:59:59,999 --> 99:59:59,999 If you think a line would look bad in your drawing, then stick to soft edges there. 492 99:59:59,999 --> 99:59:59,999 I already made pretty much all of the lines I wanted to make in the drawing stage, 493 99:59:59,999 --> 99:59:59,999 so those will be the only hard edges. 494 99:59:59,999 --> 99:59:59,999 Anyway, I started out pretty experimental, 495 99:59:59,999 --> 99:59:59,999 with some of the painting stuff early on, 496 99:59:59,999 --> 99:59:59,999 but I wasn't that into it this time, so I'm slowly going to be dialling that back 497 99:59:59,999 --> 99:59:59,999 as we go. Almost all of these arms 498 99:59:59,999 --> 99:59:59,999 are going to be out of direct light, you know, ambient light for the most part, 499 99:59:59,999 --> 99:59:59,999 aside from the one on the right that is reaching toward us. 500 99:59:59,999 --> 99:59:59,999 Doing this somewhat makes the whole image a bit darker and more saturated than 501 99:59:59,999 --> 99:59:59,999 I wanted, so I'll be desaturating and lightening it a bit as we go. 502 99:59:59,999 --> 99:59:59,999 Other than that, I definitely kept the line art in play for a lot longer than I normally do. 503 99:59:59,999 --> 99:59:59,999 It's not until most of the form rendering is complete that I actually 504 99:59:59,999 --> 99:59:59,999 flatten things down and start painting out the lines. 505 99:59:59,999 --> 99:59:59,999 This is also when I start playing with slightly more interesting shapes 506 99:59:59,999 --> 99:59:59,999 in some of them. 507 99:59:59,999 --> 99:59:59,999 The rim light is going to be pretty subtle today, 508 99:59:59,999 --> 99:59:59,999 I definitely made it more limelight than I normally recommend to people, 509 99:59:59,999 --> 99:59:59,999 but still trying to at least taper those lines and find some 510 99:59:59,999 --> 99:59:59,999 chunkier shapes with it. 511 99:59:59,999 --> 99:59:59,999 To bring back some of the other fun stuff from the skin rendering video, 512 99:59:59,999 --> 99:59:59,999 I decided to put in some body hair on the top left arm. 513 99:59:59,999 --> 99:59:59,999 Just a bit of fun with desaturating colors and pattern-based brushwork. 514 99:59:59,999 --> 99:59:59,999 This was also when I decided to at least connect the fingers that I had there, 515 99:59:59,999 --> 99:59:59,999 but we're almost done, so the last 516 99:59:59,999 --> 99:59:59,999 thing I want to have fun with, is bringing some of that body hair into the rim light. 517 99:59:59,999 --> 99:59:59,999 It makes the rim light a lot more fun. 518 99:59:59,999 --> 99:59:59,999 Definitely recommend trying it when you can. 519 99:59:59,999 --> 99:59:59,999 And, with that, this monster of a video is finally complete. 520 99:59:59,999 --> 99:59:59,999 It has been a journey, and while the drawings and paintings might not be perfect, 521 99:59:59,999 --> 99:59:59,999 hopefully you at least feel a bit more confident 522 99:59:59,999 --> 99:59:59,999 about being able to draw some fun arms from imagination. 523 99:59:59,999 --> 99:59:59,999 As always, the best way to fully learn is to mix in 524 99:59:59,999 --> 99:59:59,999 equal parts of drawing from human reference, 525 99:59:59,999 --> 99:59:59,999 doing master copies of other artists you like, 526 99:59:59,999 --> 99:59:59,999 and drawing from imagination. 527 99:59:59,999 --> 99:59:59,999 No matter how good or bad you might feel about 528 99:59:59,999 --> 99:59:59,999 one of these three parts, do them all evenly regardless. 529 99:59:59,999 --> 99:59:59,999 We only focussed on three main muscles in this video, 530 99:59:59,999 --> 99:59:59,999 so if you find yourself wanting to build up more complexity, 531 99:59:59,999 --> 99:59:59,999 just go check out one of the other amazing art YouTube 532 99:59:59,999 --> 99:59:59,999 channels that dives a bit deeper. 533 99:59:59,999 --> 99:59:59,999 Alright, I want to thank you all so much 534 99:59:59,999 --> 99:59:59,999 or at least giving this video a chance, 535 99:59:59,999 --> 99:59:59,999 I'm not a frequent uploader, so be sure to subecribe 536 99:59:59,999 --> 99:59:59,999 if you don't want to miss out on the 537 99:59:59,999 --> 99:59:59,999 handful of videos I put out each year. 538 99:59:59,999 --> 99:59:59,999 Of course, if you want some fun, specialised content 539 99:59:59,999 --> 99:59:59,999 the brainstorm classes have been going really well 540 99:59:59,999 --> 99:59:59,999 and its definitely worth your time and money 541 99:59:59,999 --> 99:59:59,999 if you haven't tried them out yet. 542 99:59:59,999 --> 99:59:59,999 Info is down in the description. 543 99:59:59,999 --> 99:59:59,999 I also, of course, do want to give an earnest thank you 544 99:59:59,999 --> 99:59:59,999 to the Patreon supporters that chip in 545 99:59:59,999 --> 99:59:59,999 money to keep these videos coming. 546 99:59:59,999 --> 99:59:59,999 You guys are wondeful. 547 99:59:59,999 --> 99:59:59,999 Seeya everyone. 548 99:59:59,999 --> 99:59:59,999 [Electronic buzz effect]